In-Situ Nanomechanical Testing

nanoDynamic Mode

Nanoscale dynamic mechanical testing for Hysitron PI Series PicoIndenters

Apply an oscillating force to continuously measure viscoelastic and fatigue properties as a function of contact depth, frequency, and time

Schematic of sinusoidal force and resultant displacement data as measured using nanoDynamic Mode. Equations for storage (E’) and loss (E’’) modulus are given on the right.

Materials such as biological materials, glasses, polymers, and some metals exhibit significant time dependency with respect to mechanical properties. This viscoelasticity makes it difficult to completely describe the material response using traditional nanoindentation techniques. Building upon traditional dynamic mechanical analysis theory (DMA), Bruker has established its nanoDynamic Mode option for the in-situ mechanical analysis of nanoscale materials.

A plot of the applied load amplitude (red) and resulting displacement (blue) data from a 1 Hz dynamic loading test on a metallic thin film.

nanoDynamic Mode offers several testing modes in which an oscillating force is applied to a sample and the resultant displacement amplitude and phase shift are measured using a lock-in amplifier. Using this technique, the contact stiffness and damping properties of the material can be accurately determined, allowing for the measurement of storage (E’) and loss (E’’) moduli, as well as tan delta. Additionally, this technique has been expanded to include additional testing modes for characterizing creep and inducing fatigue in a wide variety of materials or structures while deformation is simultaneously monitored with the electron microscope.